JP2015077045A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus without the need of increasing the size of a wiring section connecting a battery and a substrate even in charging the battery by non-contact charging.SOLUTION: An electronic apparatus includes: a charging circuit section charging a battery with electromotive force by electromagnetic induction; a light-emitting unit causing a light-emitting section to emit light by power stored in a capacitor; a light-emitting-unit control circuit section charging the capacitor by power of the battery; a substrate on which the charging circuit section and light-emitting-unit control circuit section are mounted; and a wiring section connecting the battery and the substrate. The wiring section connects the battery and the charging circuit section using one power-supply line, and connects the battery and the light-emitting-unit control circuit section.

Description

  The present invention relates to an electronic device capable of contactless charging.

  In recent years, in a system for charging portable electronic devices driven by batteries, in view of problems such as user convenience, rusting of terminals, adhesion of dust, etc., in an electrically non-contact state such as an electromagnetic induction method. The charging method has been put to practical use. In non-contact charging in the electromagnetic induction method, charging is performed using a principle of electromagnetic induction between a power feeding device having a power feeding coil and an electronic device having a power receiving coil. At this time, a wiring board on which a power reception control circuit is mounted in addition to the power reception coil is required on the electronic device side. In Patent Document 1, a receiving coil is reduced in size by adding a booster circuit, a step-down circuit, and the like.

JP 2008-104319 A

  However, in Patent Document 1, it is necessary to flow a large current when performing high-speed charging. For this reason, it is necessary to increase the wiring from the wiring board to the battery, which is an adverse effect of downsizing the device. In addition, when a flexible wiring board is used, a desired wiring width may not be ensured unless it is a double-sided flexible wiring board due to restrictions on the board width, leading to an increase in cost.

  In view of such problems, the present invention provides an electronic device that does not increase the size of a wiring portion that connects a battery and a substrate even when the battery is charged by non-contact charging. With the goal.

  An electronic device according to one aspect of the present invention includes a charging circuit unit that charges a battery with an electromotive force generated by electromagnetic induction, a light emitting unit that causes a light emitting unit to emit light with power stored in the capacitor, and the capacitor is charged with the power of the battery. A light emitting unit control circuit unit, a substrate on which the charging circuit unit and the light emitting unit control circuit unit are mounted, and a wiring unit that connects the battery and the substrate, wherein the wiring unit is a single power source. The battery and the charging circuit unit are connected by a line, and the battery and the light emitting unit control circuit unit are connected.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where a battery is charged by non-contact charge, the electronic device which does not enlarge the size of the wiring part which connects a battery and a board | substrate can be provided.

It is a disassembled perspective view of the digital camera which is an example of the electronic device which concerns on embodiment of this invention. It is the figure which showed the connection of strobe-non-contact charging board. It is an external perspective view of a strobe unit. It is a block diagram of a digital camera. It is a wiring diagram of a strobe-non-contact charging board. It is a connector terminal part wiring diagram of a relay flexible wiring board.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is an exploded perspective view of a digital camera which is an example of an electronic apparatus according to an embodiment of the present invention with an exterior cover removed. FIG. 1A is a front exploded perspective view, and FIG. 1B is a rear exploded perspective view. FIG. 2 is a diagram showing the connection between the strobe and the non-contact charging board.

  The lens barrel 101 holds the lens 102. The flexible wiring board 103 is an operation system flexible wiring board on which operation parts are arranged, and a release button 104 and a power button 105 are mounted thereon. Electronic components such as an engine (control signal output unit) 107, a memory, a lens barrel drive circuit, an audio circuit, and a power supply circuit are mounted on the main wiring board 106. The AF auxiliary light 108 emits light to facilitate focusing in a dark place. The strobe unit 109 includes a strobe light emitting unit 110 and a strobe main capacitor 111. The main chassis 112 holds the lens barrel 101, the strobe unit 109, and the battery box 113. An imaging element is mounted on the imaging flexible wiring board 114.

  The strobe-non-contact charging board 115 is composed of the same multilayer board having two or more layers. A strobe circuit block (light emitting unit control circuit unit) 301 and a non-contact charging circuit block (charging circuit unit) 302 are arranged on the strobe-noncontact charging board 115. The non-contact charging circuit block 302 charges the battery 119 with an electromotive force due to electromagnetic induction. The relay flexible wiring board (wiring unit) 116 functions to relay the strobe-non-contact charging board 115 and the main wiring board 106. The relay flexible wiring board 116 is connected to the connector 117 on the main wiring board 106 and the connector 118 on the strobe-non-contact charging board 115.

  The battery 119 is connected to the main wiring board 106 by a battery connector 120 mounted on the main wiring board 106. The power supply IC 121 is mounted on the power supply circuit block of the main wiring board 106. The power receiving coil 122 is held by the strobe unit 109.

  Next, the configuration of the strobe and the non-contact charging unit will be described with reference to FIG. FIG. 3 is an external perspective view of the strobe unit 109. 3A is a front perspective view, and FIG. 3B is a rear perspective view.

  The strobe light emitting unit 110 and the strobe main capacitor 111 are connected to a strobe circuit block on the strobe-non-contact charging board 115 by soldering with lead wires 127.

  The strobe light emitting unit 110 houses a xenon tube and a trigger coil (not shown). The strobe light emitting unit 110 is held by a strobe holder 123 and is covered with a strobe cover 124 at the top. The strobe main capacitor 111 is held by the arm portion 123a of the strobe holder 123 so as to surround the side surface, and is fixed with double-sided tape. The power receiving coil 122 is held by the strobe holder lower portion 123b. Lead wires 122 a and 122 b of the power receiving coil 122 are soldered to the strobe-non-contact charging board 115.

  The magnetic material sheet 125 is made of a magnetic material and is attached between the strobe main capacitor 111 and the power receiving coil 122. The case of the strobe main capacitor 111 is made of metal, and by sticking the magnetic material sheet 125, the influence of the magnetic field on the power receiving coil 122 by the metal can be suppressed.

  The strobe holder 123 has a resin spring portion 123c for pressing the strobe main capacitor 111 against the magnetic material sheet 125 side. By maintaining the strobe main capacitor 111 in close contact with the magnetic material sheet 125, heat generated during electromagnetic induction can be released to the metal case of the strobe main capacitor 111. Further, the magnetic material sheet 125 has elasticity, and heat can be efficiently transferred by being in close contact therewith. The heat transferred to the strobe main capacitor 111 is diffused to the entire electronic device via a heat conductive sheet 126 affixed to the side surface of the strobe main capacitor 111 and an extension 112 a extended from the main chassis 112.

  Further, the resin spring portion 123c of the strobe holder 123 can alleviate the impact when the electronic device falls from the power receiving coil 122 side, and can suppress damage to components and stress on the soldering portion of the power receiving coil.

  FIG. 4 is a circuit block diagram of the digital camera 20 and the power feeding device 50. A strobe circuit block 301 and a non-contact charging circuit block 302 are arranged in the circuit block of the digital camera 20. The digital camera 20 and the power feeding device 50 include a power receiving coil 122 and a power feeding coil 505, respectively.

  The detection unit 501 detects that the digital camera 20 is set in the power supply device 50. The power feeding main control unit 502 performs power feeding management control based on information of the power feeding control unit 503, the power supply unit 504, and the detection unit 501.

  A power reception control unit 202 is disposed in the non-contact charging circuit block 302, and a power reception coil 122 is connected to the power reception control unit 202. The power reception control unit 202 is instructed from the engine 107 through a control signal wiring (control signal line) 210, a command related to charging, battery information, and the like. The power reception control unit 202 includes a switching circuit, and charging control such as switching is performed during charging.

  The battery plus power supply wiring (power supply line) 204 and the ground wiring 205 are wired from the battery 119 through the battery connector 120 to the main wiring board 106 and connected to the connector 117 on the main wiring board 106. The control signal wiring 210 is formed on the main wiring board 106 on which the engine 107 is mounted, and is connected to the connector 117. The battery plus power line 204, the ground line 205, and the control signal line 210 are wired to the strobe-noncontact charging board 115 and connected to the connector 118 on the strobe-noncontact charging board 115. Furthermore, the battery plus power supply wiring 204, the ground wiring 205, and the control signal wiring 210 are also formed on the relay flexible wiring board 116 that connects the connector 117 and the connector 118. Therefore, the battery plus power supply wiring 204, the ground wiring 205, and the control signal wiring 210 are connected to the strobe-non-contact charging board 115 via the relay flexible wiring board 116. The battery plus power line 204, the ground line 205, and the control signal line 210 are branched in the strobe-non-contact charging board 115, and are wired to the strobe circuit block 301 and the non-contact charging circuit block 302, respectively. The battery plus power supply wiring 204 formed on the relay flexible wiring board 116 is one power supply line. The ground wiring 205 formed on the relay flexible wiring board 116 is one ground line. The control signal wiring 210 formed on the relay flexible wiring board 116 is one control signal line.

  In the strobe circuit block 301, a strobe light emission control unit 206 and a strobe main capacitor charging unit 207 are arranged. A strobe main capacitor charging start signal (hereinafter referred to as a charging start signal), a strobe main capacitor charging completion signal (hereinafter referred to as a charging completion signal), and the like are sent from the engine 107 to the strobe light emission control unit 206 through the wiring 210.

  The control signal transmitted from the engine 107 to the power reception control unit 202 and the control signal transmitted from the engine 107 to the strobe light emission control unit 206 both pass through the control signal wiring 210. These control signals are transmitted using serial communication. The power reception control unit 202 and the strobe light emission control unit 206 discriminate between the control signal transmitted to the strobe light emission control unit 206 and the control signal transmitted to the power reception control unit 202 based on the signal ID, and execute the designated command. .

  In addition, a strobe light emission is performed by sending a strobe light emission signal from the engine 107 to the strobe light emission control unit 206 through the strobe light emission signal wiring (light emission signal line) 211. In general, when a signal is transmitted using serial communication, a delay occurs in an operation performed using a signal transmitted by an ID reading process or the like as a trigger. Since the strobe light emission needs to be emitted without delay at the photographing timing, it is wired as a single signal line independent of the control signal wiring 210 for serial communication. The strobe light emission signal wiring 211 is wired to the main wiring board 106, the strobe-non-contact charging board 115, and the relay flexible wiring board 116, respectively. The strobe light emission signal wiring 211 connects the engine 107 and the strobe light emission control unit 206 by connecting the main wiring board 106 and the strobe-non-contact charging board 115 by the relay flexible wiring board 116.

  A battery plus power supply wiring 204 and a ground wiring 205 are connected to the strobe main capacitor charging unit 207.

  The battery 119 is connected to the DC / DC converter (voltage conversion unit) 201 via the battery connector 120 and the battery plus power supply wiring 204 and the ground wiring 205 on the main wiring board 106. The DC / DC converter 201 is mounted on the main wiring board 106 and converts the output voltage of the battery 119 into a desired output voltage (for example, 3.3 V) used in the digital camera 20.

  The drive power supply wiring (drive power supply line) 212 is a wiring that outputs the voltage converted by the DC / DC converter 201 to the strobe light emission control unit 206 and the power reception control unit 202. The drive power supply wiring 212 is wired to the main wiring board 106, the strobe-non-contact charging board 115, and the relay flexible wiring board 116, respectively.

  Here, since the strobe light emission control IC 303 included in the strobe light emission control unit 206 and the power reception control IC 304 included in the power reception control unit 202 use the same drive voltage, one relay flexible wiring board 116 is provided. A drive power supply wiring 212 is formed. When the relay flexible wiring board 116 connects the connector 117 and the connector 118, one drive power wiring 212 connects the DC / DC converter 201 and the strobe light emission control unit 206, and the DC / DC converter 201 and the power reception control unit. 202 is connected.

  FIG. 5 is a wiring diagram of the strobe-non-contact charging board 115. FIG. 5A is a component surface wiring diagram, and FIG. 5B is a solder surface wiring diagram.

  The strobe-non-contact charging board 115 is a double-sided board, and electrical connection between the component surface and the solder surface is performed using a through hole. The relay flexible wiring board 116 is inserted into the connector 118 mounted on the component surface.

  Of the battery plus power supply wiring 204, the battery plus power supply wiring before being connected to the inductor 305 is designated 204a, and the battery plus power supply wiring after passing through the inductor 305 is designated 204b. The inductor 305 is provided to reduce voltage fluctuation from the battery 119.

  The battery plus power supply wiring 204b is used for charging the strobe main capacitor 111 and charging the battery 119 during non-contact charging. Therefore, the battery plus power supply line 204b branches and is connected to the terminal of the strobe boosting transformer 306 as a power supply line for strobe and to the terminal of the power reception control IC 304 as a power supply line for non-contact charging. In addition, a capacitor 307 is mounted on the battery plus power supply wiring 204 b with respect to the ground wiring 205. The capacitor 307 is provided to reduce power supply noise superimposed on the battery plus power supply wiring 204a.

  Since the inductor 305 and the capacitor 307 can be shared by the strobe circuit block 301 and the non-contact charging circuit block 302, the mounting area can be reduced.

  Also, a capacitor 308 for storing electric charge during charging and a diode 309 for preventing backflow are mounted in the immediate vicinity of the lead wire 122a of the power receiving coil 122.

  The control signal wiring 210 includes a serial data wiring (data signal line) 210a and a serial clock wiring (clock signal line) 210b, and is connected to the strobe light emission control IC 303 and the power reception control IC 304, respectively. The drive power supply wiring 212 is commonly used by the strobe light emission control IC 303 and the power receiving IC 304.

  As shown in FIG. 5A, the strobe circuit block 301 and the non-contact charging circuit block 302 are separately arranged on the component surface of the strobe-non-contact charging board 115. As shown in FIG. 5B, on the solder surface of the strobe-non-contact charging substrate 115, the ground wiring 205 is separated into a strobe ground line 205a and a non-contact charging ground line 205b by a slit 310. On the component side of the strobe-non-contact charging board 115, the connector 118 is disposed so as to straddle the strobe circuit block 301 and the non-contact charging circuit block 302. On the solder surface of the strobe-non-contact charging board 115 shown in FIG. 5B, the strobe ground line 205a and the non-contact charging ground line 205b are connected at the connector corresponding portion 205c corresponding to the region where the connector 118 is mounted. It is wired to be.

  As a result, the separation between the strobe circuit block 301 and the non-contact charging circuit block 302 of the strobe-non-contact charging board 115 is improved, and it is possible to suppress the noise during strobe light emission from being superimposed on the non-contact charging circuit block 302. . In addition, since the high voltage wiring portion of the strobe circuit block 301 is arranged in a region as far as possible from the non-contact charging circuit block 302, the signal of the non-contact charging block 302 affects the influence of the high voltage wiring portion of the strobe circuit block 301. You can prevent it.

  FIG. 6 is a connector terminal portion wiring diagram of the relay flexible wiring board 116.

  In the present embodiment, the battery plus power supply wiring 204 and the ground wiring 205 for supplying power to the strobe circuit block 301 and the non-contact charging circuit block 302 become one power supply line and one ground line in the relay flexible wiring board 116. Yes. In other words, the battery plus power wiring 204 formed on the relay flexible wiring board 116 serves as both the power line of the strobe circuit block 301 and the power line of the non-contact charging circuit block 302. Similarly, the ground wiring 205 formed on the relay flexible wiring board 116 serves as both the ground line of the strobe circuit block 301 and the ground line of the non-contact charging circuit block 302.

  The strobe main capacitor 111 needs to be charged when photographing, and the non-contact charging is performed when photographing is not performed. The strobe circuit block 301 and the non-contact charging circuit block 302 are not used at the same time.

  When the strobe main capacitor charging unit 207 charges the strobe main capacitor 111, power is also supplied to the power reception control unit 202. However, since the power reception control unit 202 is not in an operating state, the power reception control unit 202 does not consume power. On the other hand, when the power reception control unit 202 charges the battery 119, the electromotive force of the power reception coil 122 is also supplied to the strobe main capacitor charging unit 207. However, since the strobe main capacitor charging unit 207 is not in an operating state, the strobe main capacitor 111 is not charged by the electromotive force of the power receiving coil 122.

  As a result, the strobe circuit block 301 and the battery 119 can be connected by one power line formed on the relay flexible wiring board 116, and the non-contact charging circuit block 302 and the battery 119 can be connected. The battery plus power supply wiring 204 and the ground wiring 205 formed on the relay flexible wiring board 116 have a larger maximum current value between the maximum current value of the strobe circuit block 301 and the maximum current value of the non-contact charging circuit block 302. The wiring width corresponding to is formed.

  The strobe circuit block 301 and the engine 107 can be connected by one control signal wiring 210 formed on the relay flexible wiring board 116, and the non-contact charging circuit block 302 and the engine 107 can be connected. Similarly, the strobe circuit block 301 and the DC / DC converter 201 are connected by one drive power supply wiring 212 formed on the relay flexible wiring board 116, and the non-contact charging circuit block 302 and the DC / DC converter 201 are connected. can do.

  Therefore, the relay flexible wiring board 116 can be formed of a single-sided flexible wiring board, and the size of the flexible wiring board can be reduced.

  In the present embodiment, the battery plus power supply wiring 204 and the ground wiring 205 are once connected to the main wiring board 106 and then connected to the battery 119 via the battery connector 120 mounted on the main wiring board 106. However, when the AA battery is used and the battery connector is not mounted on the main wiring board 106 and the battery contact piece is held alone in the battery box or the like, the relay flexible wiring board 116 is directly connected to the battery contact piece. You may connect. Further, the battery connector 120 may be mounted on the relay flexible wiring board 116. In that case, the electric power from the battery is sent directly from the relay flexible wiring board 116 to the strobe-contactless charging board 115 and further sent to the main wiring board 106 for use in the DC / DC converter 201.

  In this embodiment, the flexible wiring board is used for the connection between the strobe-contactless charging board 115 and the main wiring board 106, but a cable may be used, and the number of signal lines does not change. Easy wiring and space saving.

  Further, when the center of the cylindrical strobe main capacitor 111 and the power receiving coil 122 wound in a circle are approximately matched, the space can be disposed with less waste. In the present embodiment, the power receiving coil 122 is held by the strobe unit 109, but this is not necessarily required, and any configuration is possible as long as the wiring of the power receiving coil 122 can be connected to the strobe-non-contact charging board 115.

  Further, the charging method for non-contact charging is not limited to the electromagnetic induction method, and may be an electromagnetic resonance method.

  As described above, adding a non-contact charging circuit increases wiring, making wiring in the device difficult, but by using the non-contact charging circuit and strobe circuit wiring in common, the wiring width is increased. Wiring can be done without doing so, leading to miniaturization of electronic equipment. In addition, since the number of wirings can be reduced, the number of cables can be reduced, or single-sided wiring of a flexible wiring board can be performed, so that inexpensive wiring is possible.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

109 Strobe unit (light emitting unit)
111 Strobe main capacitor (capacitor)
115 Strobe-contactless charging board (board)
116 Relay flexible wiring board (wiring section)
119 Battery 122 Power receiving coil 201 DC / DC converter (voltage conversion unit)
202 Power reception control unit 204 Battery plus power line (power line)
205 Ground wiring 206 Strobe light emission control unit (light emission control unit)
301 Strobe circuit block (light emitting unit control circuit section)
302 Non-contact charging circuit block (charging circuit part)

Claims (6)

A charging circuit for charging the battery with electromotive force by electromagnetic induction;
A light-emitting unit that emits light from the light-emitting unit with the power stored in the capacitor;
A light emitting unit control circuit unit for charging the capacitor with the power of the battery;
A substrate on which the charging circuit unit and the light emitting unit control circuit unit are mounted;
A wiring portion for connecting the battery and the substrate;
The said wiring part connects the said battery and the said light emission unit control circuit part while connecting the said battery and the said charging circuit part with one power supply line, The electronic device characterized by the above-mentioned. A voltage conversion unit that converts the output voltage of the battery to output a driving voltage for driving the charging circuit unit;
The light emitting unit control circuit unit is driven with a drive voltage equal to the drive voltage, and includes a light emission control unit that controls light emission of the light emitting unit,
2. The wiring unit according to claim 1, wherein the wiring unit connects the voltage conversion unit and the charging circuit unit with one drive power supply line, and connects the voltage conversion unit and the light emission control unit. Electronics. A control signal output unit that outputs a control signal to the charging circuit unit and the light emitting unit control circuit unit;
The wiring unit connects the control signal output unit and the charging circuit unit through one control signal line different from the drive power supply line, and connects the control signal output unit and the light emitting unit control circuit unit. The electronic device according to claim 2.   4. The electronic apparatus according to claim 3, wherein the control signal line includes a data signal line and a clock signal line for transmitting data by serial communication.   5. The electronic apparatus according to claim 2, wherein the wiring unit connects the control signal output unit and the light emission control unit through a light emission signal line different from the control signal line. 6. . A connector to which the wiring part is connected is mounted on the substrate,
The electronic device according to claim 1, wherein the connector is mounted on the board so as to straddle the charging circuit unit and the light emitting unit control circuit unit.